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| 型号： | LTC1285IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC A/D CONV SAMPLING 12BIT 8SOIC |
| 标准包装： | 2,500 |
| 位数： | 12 |
| 采样率（每秒）： | 7.5k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 480µW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，单极 |
15
LTC1285/LTC1288
APPLICATION INFORMATION
WU
U
Figure 7. LTC1288 “+” and “–” Input Settling Windows
BOARD LAYOUT CONSIDERATIONS
Grounding and Bypassing
The LTC1285/LTC1288 are easy to use if some care is
taken. They should be used with an analog ground plane
and single point grounding techniques. The GND pin
should be tied directly to the ground plane.
The VCC pin should be bypassed to the ground plane with
a 10
F tantalum capacitor with leads as short as possible.
If the power supply is clean, the LTC1285/LTC1288 can
also operate with smaller 1
F or less surface mount or
ceramic bypass capacitors. All analog inputs should be
referenced directly to the single point ground. Digital
inputs and outputs should be shielded from and/or routed
away from the reference and analog circuitry.
SAMPLE-AND-HOLD
Both the LTC1285 and the LTC1288 provide a built-in
sample-and-hold (S&H) function to acquire signals. The
S&H of the LTC1285 acquires input signals from “+” input
relative to “–” input during the tSMPL time (see Figure 1).
However, the S&H of the LTC1288 can sample input
signals in the single-ended mode or in the differential
inputs during the tSMPL time (see Figure 7).
CLK
DIN
DOUT
"+" INPUT
"–" INPUT
SAMPLE
HOLD
"+" INPUT MUST
SETTLE DURING
THIS TIME
tSMPL
tCONV
CS
SGL/DIFF
START
MSBF
DON’T CARE
1ST BIT TEST "–" INPUT MUST
SETTLE DURING THIS TIME
B11
LTC1285/88 F07
Figure 6. Interfacing a 3V Powered LTC1285 to a 5V System
+IN
–IN
GND
VCC
CLK
DOUT
VREF
3V
4.7
F
MPU
(e.g. 8051)
5V
P1.4
P1.3
P1.2
LTC1285/88 F06
DIFFERENTIAL INPUTS
COMMON-MODE RANGE
0V TO 3V
3V
LTC1285
CS
of Maximum Clock Rate vs Supply Voltage). If the maxi-
mum clock frequency is used, care must be taken to
ensure that the device converts correctly.
Mixed Supplies
It is possible to have a microprocessor running off a 5V
supply and communicate with the LTC1285/LTC1288
operating on a 3V supply. The inputs of CS, CLK and DIN
of the LTC1285/LTC1288 have no problem to take a
voltage swing from 0V to 5V. With the LTC1285 operating
on a 3V supply, the output of DOUT may only go between
0V and 3V. The 3V output level is higher enough to trip a
TTL input of the MPU. Figure 6 shows a 3V powered
LTC1285 interfacing a 5V system.
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